1. When is the best time to get pregnant? Different people have different considerations when choosing the time to get pregnant. However, from a medical point of view, the most physiologically suitable time for women to become pregnant is between the ages of 20 and 30. In this age group, women have the best physical health, regular ovulation cycles, and the strongest fertility. 2. How to calculate ovulation. If you want to know when you are most likely to get pregnant, you need to first understand your menstrual cycle. The menstrual cycle usually lasts about 28 days, but it can be as short as 21 days or as long as 35 days. The ovulation period refers to the 5 days before ovulation and 4 days after ovulation in the menstrual cycle. During this time